(Reuters) - For the first time in decades, the United States is making steady gains in the number of high school students earning diplomas, putting it on pace to reach a 90 percent graduation rate by 2020, according to a new analysis released Monday. But the good news comes with a big asterisk: students with learning disabilities and limited fluency in English face long odds to finish high school, with graduation rates for those groups as low as 25 percent in some states, the analysis found. ...